Ledger Lines
Because there are many higher and lower versions of notes in music, it is sometimes necessary to write notes above or below a staff. This is done by the addition of ledger lines. A ledger line is a short line which effectively adds another line to either a treble or bass staff. There is no restriction in the number of ledger lines that can be used in written music; the note sequence simply continues from the highest or lowest note on the staff, depending on whether the music goes up or down. The most common use of a ledger line is for the note middle C, which falls between the treble and bass staves (in the middle). Middle C is the middle C note on a piano keyboard. It is a reference note for measuring higher and lower notes against. This note is shown here, along with other notes using ledger lines.
